package 网络编程;


import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Scanner;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class TcpEchoServer {
    private ServerSocket serverSocket=null;
    public TcpEchoServer(int port) throws IOException {
        serverSocket=new ServerSocket(port);
    }
    public void start() throws IOException {
        System.out.println("服务器启动\n");
        ExecutorService pool=Executors.newCachedThreadPool();
        while(true){
            Socket clientSocket=serverSocket.accept();
            pool.submit(new Runnable() {
                @Override
                public void run() {
                    processConnection(clientSocket);
                }
            });
        }

    }
    public void processConnection(Socket clientSocket){
        System.out.println("客户端建立连接\n");
        try(InputStream inputStream=clientSocket.getInputStream()){
            try(OutputStream outputStream=clientSocket.getOutputStream()){
                Scanner scanner=new Scanner(inputStream);
                while(true){
                    if(!scanner.hasNext()){
                        System.out.println("客户端断开连接\n");
                        break;
                    }
                    String request=scanner.next();
                    String response=process(request);
                    PrintWriter printWriter=new PrintWriter(outputStream);
                    printWriter.println(response);
                    printWriter.flush();
                    System.out.printf("[%s:%d] req:%s resp:%s\n",clientSocket.getInetAddress().toString(),clientSocket.getPort(),request,response);
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    public String process(String request){
        return request;
    }

    public static void main(String[] args) throws IOException {
        TcpEchoServer server=new TcpEchoServer(9090);
        server.start();
    }
}
